If your transaction fails, and the error message includes replacement transaction underpriced this happens because of a combination of nonce and gas price.
Submitting multiple transactions with the same nonce but at a lower gas price than previous transaction would have this error message.
To fix this error message and successfully submit a transaction, you will need to submit a transaction with the same nonce + higher gas price than previously submitted.
If you are still seeing the replacement transaction underpriced error message after trying these solutions, please don’t hesitate to reach out to our team in Discord.